英语语法知识

三种时态：一般现在、 现在进行、一般过去 掌握现在分词、过去式
祈使句:肯定 动词原形开头 否定：前面加don't
非谓语动词：want to do would like to do decide to do hope to do ask sb.to do tell sb.to do want sb.to do would like sb.to do would like sb.to do it's time to do
practice doing enjoy doing spend...(in) doing what about doing Thanks for doing watch/see/hear/ find sb.do/ doing have (fun ) doing
help sb do/ to do why not do had better do make/ let sb.do
情态动词 can 表示能力；允许 have to 必须,不得不
介词用法（Unit2）across from next to in front of behind on the left/ right of betwwn...and...